luceos
hum... I didn't think of that.
I checked flarum logs but there are no entries regarding this issue.
Apache logs on the other hand have something regarding the 500 erro...
In access_log, I get this:
<source_ip> - - [21/Nov/2018:05:09:24 -0500] "GET /flarum/ HTTP/1.1" 200 5103 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
<source_ip> - - [21/Nov/2018:05:09:27 -0500] "GET /flarum/ HTTP/1.1" 200 5101 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
<source_ip> - - [21/Nov/2018:05:09:38 -0500] "GET /flarum/api/discussions?include=startUser%2ClastUser%2CstartPost%2Ctags&filter%5Bq%5D=%20tag%3Arecursos& HTTP/1.1" 200 14747 "http://<forum_ip>/flarum/" "Mozilla/5.0 (Windows NT
10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
<source_ip> - - [21/Nov/2018:05:09:41 -0500] "GET /flarum/api/discussions/97?page%5Bnear%5D=0 HTTP/1.1" 200 6656 "http://<forum_ip>/flarum/t/recursos" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63
.0"
<source_ip> - - [21/Nov/2018:05:09:44 -0500] "GET /flarum/api/flagrow/download/6e0bb2e0-ceb6-42ae-83f3-c37fc9cee20c/185/yjZmIdRbDG8WHDNhdP8pu5YJ6DJSvIT3vuEdhUpa HTTP/1.1" 500 57 "http://<forum_ip>/flarum/d/97-ipcalc-c-lculo-de-r
edes-e-subnets" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0"
I can't find any other entrys/logs...
Anything makes sense in the output above?
Cheers
EDIT: I only assume this is a 500 error because I get this on the browser:

EDIT2: After enabling debug, I get this in the error output:
(...)"Flagrow\Upload\Exceptions\InvalidDownloadException: cURL error 7: Failed connect to <OLD_SERVER_IP>:80;"(...)
Why is it trying to reach my old server? Maybe some setting somewhere?